Seven of Earth’s nine planetary boundaries are breached, and all seven are worsening

The Potsdam Institute for Climate Impact Research reported on September 21, 2026 that seven of Earth’s nine planetary boundaries are breached and that all seven continue to worsen. The finding comes from the 2026 Planetary Health Check, written by more than 60 scientists at the institute’s Planetary Boundaries Science Lab.

The seven are climate change, change in biosphere integrity, modification of biogeochemical flows, introduction of novel entities, land system change, freshwater change and ocean acidification.

The seven boundaries, sorted by how far past the line they are

According to the Down To Earth account of the report, four of the seven sit in the high-risk zone: climate change, biosphere integrity, biogeochemical flows, which covers nitrogen and phosphorus, and novel entities, the human-made chemicals and materials the planet has not absorbed before. Three are in the increasing-risk zone: land system change, freshwater change and ocean acidification. The two boundaries still inside the safe operating space are atmospheric aerosol loading and stratospheric ozone depletion.

Ocean acidification is the newest entry. The institute’s release as distributed through EurekAlert says it became the seventh transgressed boundary in 2025.

The framework itself dates to 2009, when it was introduced as a way to define a safe operating space for humanity across nine processes that keep Earth stable. The Stockholm Resilience Centre’s summary of the 2023 mapping describes the boundaries as quantifiable thresholds, and the same summary notes that the ozone boundary, transgressed in the 1990s, recovered thanks to the Montreal Protocol. The 2026 check keeps that ozone result in the safe column, alongside aerosols.

The Planetary Health Check on what links the breaches

Lead author Boris Sakschewski said that “pressure is rising across every Planetary Boundary already outside the safe operating space,” a sentence the institute placed at the top of its release. The claim that all seven are getting worse appears in the release’s summary line: seven breached boundaries continue to worsen as record ocean heat, droughts, floods, wildfires and extreme heat reveal an Earth system under strain.

Levke Caesar, another lead researcher on the report, is quoted by Courthouse News saying that climate and biosphere integrity are the core boundaries, because large and persistent changes in either can directly alter the state of the Earth system. Her larger point was one of design: the seven breaches are not seven independent systems pushed past their limits but several parts of a single connected system changing at once, so land conversion, for example, hits biodiversity and carbon storage together. On that reading the count of seven describes one connected system under strain, with the boundaries as separate readings of it, rather than seven separate problems that could be addressed one at a time.

Johan Rockström, the institute’s director, said in the release that the knowledge, capacity and solutions to change course exist. He co-authored the 2023 Science Advances assessment led by Katherine Richardson of the University of Copenhagen, which found six of the nine boundaries transgressed and pressure increasing on all of them. The six in that 2023 count were climate change, biosphere integrity, land system change, freshwater change, biogeochemical flows and novel entities, so the count has gone from six to seven in three years, the difference being ocean acidification. Every boundary the 2023 paper listed as crossed is still crossed and none has moved back inside its limit.

The year’s evidence: reefs, floods and heat

The report anchors the boundary scores to events. Bleaching-level heat stress hit about 84.4 percent of the world’s coral reef area between January 2023 and September 2025, which Down To Earth describes as the largest global coral-bleaching event observed to date. Pakistan’s 2025 monsoon floods affected 6.9 million people, ocean heat content reached a record in 2025, and Western Europe recorded its hottest June-July period on record in 2026, according to the release.

A concern the 2026 edition puts forward is the carbon sink, and the project’s own site quotes oceanographer Sylvia Earle, one of its Planetary Guardians, on how much has been learned about what makes Earth suitable for life since the 1950s. Scientists warn that vegetation and soils that absorb carbon dioxide may be losing resilience under repeated heat, drought and ecosystem degradation, which would undercut net-zero strategies that count on them. The Planetary Health Check website lists carbon sinks and novel entities as the two focus areas of this year’s edition.

The two boundaries still in the safe zone are the only good news in the report. Aerosol loading and stratospheric ozone depletion stay inside their limits, and the ozone result is the one that shows a breach can be reversed through coordinated action. Whether any of the seven can be brought back is the question the report leaves open, since its central finding is that every one of them is moving the wrong way.

This article was produced with the assistance of AI and reviewed by Morning Overview editors prior to publication.

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